题目列表(包括答案和解析)
B
What happens inside the skull of a soccer player when repeatedly heads a soccer ball? That question motivated a challenging new study of the brains of experienced players that has caused discussion and debate among soccer players, and some anxiety among those of us with soccer-playing children.
For the study, researchers at the Albert Einstein College of Medicine in New York selected 34 adults, men and women. All of the volunteers had played soccer since childhood and now competed year-round in adult soccer leagues. Each filled out a detailed questionnaire developed especially for this study to determine how many times they had headed a soccer ball in the previous year, as well as whether they had experienced any known concussions (脑震荡) in the past.
Then the players completed computerized tests of their memory and other learning skills and had their brains scanned, using a complicated new M.R.I. technique which can find structural changes in the brain that can’t be seen during most scans.
According to the data they presented at Radiological Society of North America meeting last month, the researchers found that the players who had headed the ball more than about 1,100 times in the previous 12 months showed significant loss of white matter in parts of their brains involved with memory, attention and the processing of visual information, compared with players who had headed the ball fewer times.
This pattern of white matter loss is “similar to those seen in traumatic (外伤的) brain injury”, like that after a serious concussion, the researchers reported, even though only one of these players was reported to have ever experienced a concussion.
The players who had headed the ball about 1,100 times or more in the past year were also generally worse at recalling lists of words read to them, forgetting or fumbling the words far more often than players who had headed the ball less.
【小题1】The passage is most probably a ________.
A.news report | B.research report |
C.story for soccer players | D.text for doctors |
A.Computerized test | B.Questionnaire |
C.Scanning | D.M.R.I. technique |
A.significant effect on brain | B.little effect on one’s brain |
C.nothing to do with the brain injury | D.one’s memory improved |
A.Playing soccer frequently | B.Tests of their memory |
C.White matter loss | D.Information processing |
A.remembering | B.misunderstanding | C.recalling | D.missing |
B
What happens inside the skull of a soccer player when repeatedly heads a soccer ball? That question motivated a challenging new study of the brains of experienced players that has caused discussion and debate among soccer players, and some anxiety among those of us with soccer-playing children.
For the study, researchers at the Albert Einstein College of Medicine in New York selected 34 adults, men and women. All of the volunteers had played soccer since childhood and now competed year-round in adult soccer leagues. Each filled out a detailed questionnaire developed especially for this study to determine how many times they had headed a soccer ball in the previous year, as well as whether they had experienced any known concussions (脑震荡) in the past.
Then the players completed computerized tests of their memory and other learning skills and had their brains scanned, using a complicated new M.R.I. technique which can find structural changes in the brain that can’t be seen during most scans.
According to the data they presented at Radiological Society of North America meeting last month, the researchers found that the players who had headed the ball more than about 1,100 times in the previous 12 months showed significant loss of white matter in parts of their brains involved with memory, attention and the processing of visual information, compared with players who had headed the ball fewer times.
This pattern of white matter loss is “similar to those seen in traumatic (外伤的) brain injury”, like that after a serious concussion, the researchers reported, even though only one of these players was reported to have ever experienced a concussion.
The players who had headed the ball about 1,100 times or more in the past year were also generally worse at recalling lists of words read to them, forgetting or fumbling the words far more often than players who had headed the ball less.
1.The passage is most probably a ________.
A.news report B.research report
C.story for soccer players D.text for doctors
2. In which way can researchers find the structural changes in the brain?
A.Computerized test B.Questionnaire
C.Scanning D.M.R.I. technique
3. From the passage we can conclude that frequent heading may have ________.
A.significant effect on brain B.little effect on one’s brain
C.nothing to do with the brain injury D.one’s memory improved
4.What is likely to be the cause of memory loss?
A.Playing soccer frequently B.Tests of their memory
C.White matter loss D.Information processing
5.The underlined word “fumbling” is closest in meaning to ________?
A.remembering B.misunderstanding C.recalling D.missing
What time is it? Most people are pretty accurate in their answer. And if you don’t know for sure, it’s very likely that you can find out. There may be a watch on your wrist; there may be a clock on the wall, desk, or computer screen; or maybe you’re riding in a car that has a clock in the dashboard(仪表板).
Even if you don’t have a timepiece of some sort nearby, your body keeps its own beat. Humans have an internal clock that regulates(调节) the beating of our heart, the pace of our breathing, the discharge(排出) of chemicals within our bloodstream, and many other bodily functions.
Time is something from which we can’t escape. Even if we ignore it, it’s still going by, ticking away, second by second, minute by minute, hour by hour. So the main issue in using your time well is, “Who’s in charge?” We can allow time to slip by and let it be our enemy. Or we can take control of it and make it our ally.
By taking control of how you spend your time, you’ll increase your chances of becoming a more successful student. Perhaps more importantly, the better you are at managing the time you devote to your studies, the more time you will have to spend on your outside interests.
The aim of time management is not to schedule every moment so we become slaves of a timetable that governs every waking moment of the day. Instead, the aim is to permit us to make informed choices as to how we use our time. Rather than letting the day go by, largely without our awareness, what we are going to discuss next can make us better able to control time for our own purposes.
The underlined word “ally” in Para.3 most likely means somebody or something that is ___.
A. your supporter and helps you B. under your control and obeys you
C. under your influence and follows you D. your slave and serves you
The author intends to tell you that time __________.
A. could be managed by the internal clock of human bodies
B. should be well managed for our own interest
C. should be saved for outside interests
D. could be regulated by a timepiece such as a clock or a watch
In the next part, the author would most probably discuss with you _________.
A. how to make up for lost time B. how to have a good time
C. how to make good use of time D. how to keep up with the times
A "lost tribe" that reached America from Australia may have been the first Native Americans, according to a new theory.
If proved by DNA evidence, the theory will break long established beliefs about the southerly migration of people who entered America across the Bering Strait, found it empty and occupied it.
On this theory rests the belief of Native Americans to have been the first true Americans. They would be classified to the ranks of escapee, beaten to the New World by Aboriginals (土著人) in boats.
To a European, this may seem like an academic argument, but to Americans it is a philosophical question about identity (身份), Silvia Gonzales, of Liverpool University said .
Her claims are based on skeletons found in the California Peninsula of Mexico that have skulls (头骨) quite unlike the broad Mongolian features of Native Americans. These narrow-skulled people have more in common with southern Asians, Aboriginal Australians and people of the South Pacific Region.
The bones, stored at the National Museum of Anthropology (人类学) in Mexico City, have been carbon-dated and one is 12,700 years old, which places it several thousand years before the arrival of people from the North. "We think there were several migration waves into the Americas at different times by different human groups," Dr. Gonzales said. "The timing, route and point of origin of the first colonization of the Americas remains a most contentious topic in human evolution."
But comparisons based on skull shape are not considered conclusive by anthropologists, so a team of Mexican and British scientists, backed by the Natural Environment Research Council, has also attempted to take out DNA from the bones. Dr. Gonzales declined yesterday to say exactly what the results were, as they need to be checked, but indicated that they were consistent(一致) with an Australian origin.
It is generally considered that the first Native Americans came from _____.
A.North Asia B.Australia C.South Pacific D.South Asia
The skeletons found in the California Peninsula of Mexico have _____.
A.the broad skull shape
B.the narrow skull shape
C.different features of Aboriginal Australians
D.the same features of Native Americans
The underlined “contentious” is similar in meaning to “_____”.
A.likely to cause great interest B.difficult to solve
C.well-known to all D. likely to cause argument
Which of the following statements is true according to the text?
A.Research on skulls can draw an exact conclusion.
B.DNA tests have proved the fact that the first Native Americans came from Australian.
C.Scientists are still not sure about the origin of the Native Americans.
D.People began to enter America across the Bering Strait about 12,700 years ago.
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